A fast-moving area of low pressure passed through the area overnight, leaving about an inch of snow in D.C. While the accumulation wasn't much, roads in the area were slippery during the early commute.

Several accidents snarled traffic in the region, including a multi-vehicle accident that shut down the Inner Loop of the Beltway for just under an hour.

Public schools in Stafford, Culpeper, Spotsylvania, St. Mary's, Calvert, Charles, Howard, Fauquier, Anne Arundel, Loudoun, Prince William, Prince George's, Montgomery, Fairfax and Arlington counties opened their doors two hours late Tuesday, as did schools in Alexandria and Manassas City.